排序方式: 共有62条查询结果,搜索用时 31 毫秒
41.
Safaralizadeh Elnaz Darzi Simin Janitabar Mahjoub Ali Reza Abazari Reza 《Research on Chemical Intermediates》2017,43(2):1197-1209
Research on Chemical Intermediates - Using a simple impregnation process, the present study has introduced a novel route for the photosensitization of TiO2 nanoparticles using Sudan black B dye as... 相似文献
42.
The preparation and characterization are presented of a new catalytic material comprising Mg–Al layered double hydroxide and intercalated manganese(III) 5,10,15,20‐tetrakis(4‐benzoate)porphyrinacetate. Characterization was realized via various techniques. The prepared composite exhibited excellent catalytic activity in the selective epoxidation of various olefins with tetra‐n‐butylammonium hydrogen monopersulfate as an oxidant under mild reaction conditions. Furthermore, the catalytic system could be reused nine times without significant reduction in conversion percentage and any special care or additional treatment of the catalyst. 相似文献
43.
Marc Escribà-Gelonch Elnaz Shahbazali Maarten Honing Volker Hessel 《Tetrahedron》2018,74(25):3143-3151
Process intensification commonly enables reaction acceleration and therefore continuous-flow/PAT is urgently needed. The low volumes typical for micro-flow pose challenges for online sampling operations in analytics. In this paper, a very fast process is combined with a modified ultra-high-performance liquid chromatography (UHPLC) system allowing for very fast sampling and analysis. Low-volume online sampling according to the needs posed by PAT for pharma quality control, is introduced here for UHPLC analysis of the photo-Claisen rearrangement in micro-flow. Chances and challenges are critically reviewed, including the reproducibility and robustness of the sampling. Furthermore, the ability and speed of the chosen set-up in order to capture process changes and adjust the process parameters properly is investigated. With the applied online sampling system, it was possible to perform, almost unattended and spending 12 times less sampling volume, a full factorial analysis of all relevant reaction conditions (243 experiments) in three days. Such quality-in-the-process-line (QuIProLi) online sampling avoided random errors due to automation. 相似文献
44.
Colloid Journal - Magnetic liquid marbles are defined as non-stick droplets encapsulated with hydrophobic magnetic nanoparticles. These liquid marbles show great responsiveness to external magnetic... 相似文献
45.
Ghorbanpour Monireh Soltani Behzad Shayanfar Ali Mota Ali Mehdizadeh Aghdam Elnaz Pirpour Tazehkand Abbas Ziegler Christopher J. 《Transition Metal Chemistry》2022,47(7-8):311-320
Transition Metal Chemistry - The development of suitable compounds for the effective treatment of cancer is highly demanded. Inorganic complexes based on cobalt and copper centers have revealed a... 相似文献
46.
Elnaz Asghari Muhammad Imran Abdullah Faranak Foroughi Jacob J. Lamb Bruno G. Pollet 《Current Opinion in Electrochemistry》2022
With increasing energy consumption and greenhouse gas emissions, the importance of developing renewable energy sources to replace fossil fuels has become a vital global task. Hydrogen produced via water electrolysis powered by renewable energy systems at a large scale is an essential measure to reduce greenhouse gas and particulate emissions. Electrolysers use a substantial amount of water (mainly freshwater) to produce hydrogen and oxygen at the cathode, and anode, respectively. However, seawater is preferred because it is the most abundant water resource. Although many R&D efforts on seawater electrolysis have been carried out since the 1970s, the barriers are the undesired chlorine gas evolution reaction at the anode, and corrosion induced by chloride ions. Unlike the available data for electrocatalyst materials based upon platinum group metals in pure solutions, limited data is available for electrocatalysts in seawater. Therefore, there is an urgent need to develop new electrocatalysts for seawater electrolysis. 相似文献
47.
Calin Lencar Shashank Ramakrishnan Elnaz Erfanian Uttandaraman Sundararaj 《Molecules (Basel, Switzerland)》2022,27(3)
In this work, the effects of blend ratio and mixing time on the migration of multi-walled carbon nanotubes (MWCNTs) within poly(vinylidene fluoride) (PVDF)/polyethylene (PE) blends are studied. A novel two-step mixing approach was used to pre-localize MWCNTs within the PE phase, and subsequently allow them to migrate into the thermodynamically favored PVDF phase. Light microscopy images confirm that MWCNTs migrate from PE to PVDF, and transmission electron microscopy (TEM) images show individual MWCNTs migrating fully into PVDF, while agglomerates remained trapped at the PVDF/PE interface. PVDF:PE 50:50 and 20:80 polymer blend nanocomposites with 2 vol% MWCNTs exhibit exceptional electromagnetic interference shielding effectiveness (EMI SE) at 10 min of mixing (13 and 16 dB, respectively-at a thickness of 0.45 mm), when compared to 30 s of mixing (11 and 12 dB, respectively), suggesting the formation of more interconnected MWCNT networks over time. TEM images show that these improved microstructures are concentrated on the PE side of the PVDF/PE interface. A modified version of the “Slim-Fast-Mechanism” is proposed to explain the migration behavior of MWCNTs within the PVDF/PE blend. In this theory, MWCNTs approaching perpendicular to the interface penetrate the PVDF/PE interface, while those approaching in parallel or as MWCNT agglomerates remain trapped. Trapped MWCNTs act as barriers to additional MWCNTs, regardless of geometry. This mechanism is verified via TEM and scanning electron microscopy and suggests the feasibility of localizing MWCNTs at the interface of PVDF/PE blends. 相似文献
48.
Jouyban A Shaghaghi M Zoghi E Karami N Clark BJ Acree WE 《Journal of fluorescence》2011,21(6):2111-2116
Fluorescence intensities of propranolol and atenolol in binary solvent mixtures at various temperatures are measured and mathematical
models are proposed to represent the fluorescence intensity data. The results showed that the proposed models are able to
correlate/predict the data with reasonable error. The fluorescence intensity of pyridoxal HCl in binary solvents at 25 °C
is also determined and represented by the proposed model as an additional test probe. 相似文献
49.
A review of urban transportation network design problems 总被引:1,自引:0,他引:1
Reza Zanjirani Farahani Elnaz Miandoabchi W.Y. Szeto Hannaneh Rashidi 《European Journal of Operational Research》2013
This paper presents a comprehensive review of the definitions, classifications, objectives, constraints, network topology decision variables, and solution methods of the Urban Transportation Network Design Problem (UTNDP), which includes both the Road Network Design Problem (RNDP) and the Public Transit Network Design Problem (PTNDP). The current trends and gaps in each class of the problem are discussed and future directions in terms of both modeling and solution approaches are given. This review intends to provide a bigger picture of transportation network design problems, allow comparisons of formulation approaches and solution methods of different problems in various classes of UTNDP, and encourage cross-fertilization between the RNDP and PTNDP research. 相似文献
50.
[reaction: see text] Rhodium and copper acyl nitrenoids are likely intermediates in amidoglycosylation reactions of allal 3-carbamates. Iodine(III)-mediated nitrenoid formation, interaction of this species with the glycal enol ether pi-system, and highly beta-stereoselective glycosylation occur in a one-pot process that requires no additional Lewis acid activation. 相似文献